TransactionIdIsCurrentTransactionId() doesn't seem to be well optimized for the case when an xid has not yet been assigned, so for read only transactions.
A patch for this is attached. -- Simon Riggs http://www.2ndQuadrant.com/ <http://www.2ndquadrant.com/> PostgreSQL Solutions for the Enterprise
optimize_TransactionIdIsCurrentTransactionId_readonly.v1.patch
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